"OPOLE: Opolskie". International Jewish Cemetery Project. Retrieved 20 October 2012.
icm.edu.pl
dir.icm.edu.pl
Opole, Słownik geograficzny Królestwa Polskiego i innych krajów słowiańskich, Tom VII, nakł. Filipa Sulimierskiego i Władysława Walewskiego, 1880-1914
imgw.pl
klimat.imgw.pl
"Średnia dobowa temperatura powietrza". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 3 December 2021. Retrieved 2 February 2022.
"Miesięczna suma opadu". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 9 January 2022. Retrieved 2 February 2022.
"Liczba dni z opadem >= 0,1 mm". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 15 January 2022. Retrieved 2 February 2022.
"Średnia grubość pokrywy śnieżnej". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 15 January 2022. Retrieved 2 February 2022.
"Liczba dni z pokrywą śnieżna > 0 cm". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 21 January 2022. Retrieved 2 February 2022.
"Średnia suma usłonecznienia (h)". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 15 January 2022. Retrieved 2 February 2022.
"Średnia dobowa temperatura powietrza". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 3 December 2021. Retrieved 2 February 2022.
"Miesięczna suma opadu". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 9 January 2022. Retrieved 2 February 2022.
"Liczba dni z opadem >= 0,1 mm". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 15 January 2022. Retrieved 2 February 2022.
"Średnia grubość pokrywy śnieżnej". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 15 January 2022. Retrieved 2 February 2022.
"Liczba dni z pokrywą śnieżna > 0 cm". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 21 January 2022. Retrieved 2 February 2022.
"Średnia suma usłonecznienia (h)". Normy klimatyczne 1991-2020 (in Polish). Institute of Meteorology and Water Management. Archived from the original on 15 January 2022. Retrieved 2 February 2022.